MediaWiki:Gadget-SearchBox.js

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const SearchBox = {

	init( $content ) {
		$content.find( '.template-search-box form' ).on( 'submit', SearchBox.onSubmit );
	},

	/**
	 * Fix when an exact match is tried and a prefix is present
	 * This fix will be unnecessary when https://phabricator.wikimedia.org/T249608 is resolved
 	 */
	onSubmit( event ) {
		const button = event.originalEvent.submitter;
		if ( button.name !== 'go' ) {
			return;
		}
		const form = button.closest( 'form' );
		const prefix = form.querySelector( 'input[name="prefix"]' ).value;
		if ( !prefix ) {
			return;
		}
		const search = form.querySelector( 'input[name="search"]' ).value.trim();
		if ( !search ) {
			return;
		}
		event.preventDefault();
		const subpage = search.charAt( 0 ).toUpperCase() + search.slice( 1 ); // Capitalize
		window.location.href = '/Special:Search/' + prefix + subpage;
	}
};

mw.hook( 'wikipage.content' ).add( SearchBox.init );